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Updated: Dec 22, 2025

Reverse Yeast Two-hybrid System to Identify Mammalian Nuclear Receptor Residues that Interact with Ligands and/or Antagonists
Published on: November 15, 2013
Natural ligands of RXR receptors
Patricia García1, Paula Lorenzo1, Angel R de Lera1
1Departamento de Química Orgánica, Facultade de Química, CINBIO and IBIV, Universidade de Vigo, Campus As Lagoas-Marcosende, Vigo, Spain.
Abstract:
Given the role of retinoid X receptors (RXRs) as promiscuous partners of heterodimeric complexes with other members of the Nuclear Receptor (NR) superfamily, RXR ligands (rexinoids) play fundamental roles in gene transcription, since upon ligand binding either transcriptionally activate the "permissive" subclass of heterodimers or synergize with partner ligands in the "non-permissive" subclass of heterodimers. The collection of natural products thus far reported to bind RXR are described, including those discovered by high-throughput screening (HTS), mere serendipity, and a combination of those. Detailed protocols for the diastereo- and enantioselective synthesis of (R)-9-cis-13,14-dihydroretinoic acid, a putative natural RXR ligand, are provided.
Insights
Retinoid X receptors (RXRs) are crucial for gene transcription. This study reviews natural rexinoids that bind RXRs and details the synthesis of a potential new RXR ligand.
Area of Science:
- Molecular Biology
- Endocrinology
- Medicinal Chemistry
Background:
- Retinoid X receptors (RXRs) are nuclear receptors that form heterodimers with other nuclear receptor superfamily members.
- RXR ligands, or rexinoids, modulate gene transcription through interactions with these heterodimers.
- Understanding rexinoid interactions is key to deciphering gene regulation.
Purpose of the Study:
- To comprehensively review known natural products that bind to RXRs.
- To describe the discovery methods for these natural rexinoids, including high-throughput screening and serendipity.
- To provide synthetic protocols for a specific putative natural RXR ligand.
Main Methods:
- Literature review of natural products binding RXRs.
- Description of discovery methodologies (HTS, serendipity).
- Detailed protocols for the stereoselective synthesis of (R)-9-cis-13,14-dihydroretinoic acid.
Main Results:
- A curated collection of natural rexinoids is presented.
- Various discovery pathways for RXR ligands are highlighted.
- Successful diastereoselective and enantioselective synthesis of a dihydroretinoic acid analog is achieved.
Conclusions:
- Natural rexinoids represent a diverse class of compounds modulating RXR activity.
- The synthesis of (R)-9-cis-13,14-dihydroretinoic acid provides a valuable tool for further RXR research.
- Further investigation into natural rexinoids can uncover novel therapeutic agents.
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